Multi-converter parallel control method and device, storage medium and electronic equipment

Abstract

The application discloses a kind of energy storage system multi-converter parallel control method, comprising the following steps: initialization each electrical equipment in the energy storage system;Each of the electrical equipment the converter reads the address information of itself;Each converter reads the electrical data transmitted by other converters through the first optical fiber based on the address information;Each converter determines whether the preset state of the address information of itself is the master converter, or whether it is the slave converter;If it is the master converter, the master converter sends a synchronization pulse signal to each slave converter through the second optical fiber, and if it is the slave converter, each slave converter performs grid connection based on the electrical data.The application realizes carrier synchronization between each converter, reduces the circulating current of the system, enables synchronous output of each converter when the master converter fails, and improves the reliability of the energy storage system.

Description

Technical Field

[0001] This invention relates to the technical field of power grid energy storage systems, and in particular to a method, apparatus, storage medium, and electronic equipment for parallel control of multiple converters in an energy storage system. Background Technology

[0002] Energy storage power stations that use energy storage batteries as energy storage devices have begun to adopt parallel connection of energy storage converters (PowerConversion System, PCS), which has many advantages such as capacity expansion and improved maintainability.

[0003] However, the existing parallel control methods for energy storage converters (also known as energy storage transformers, referred to as transformers in this article) have the following shortcomings: The grid-connected network after multiple transformers are connected in parallel adopts a bus system. All transformers need to be connected to a monitoring platform, which acts as a transfer device to interact with other transformers. If the monitoring platform fails, it will affect the communication quality of the entire system, and may even cause the system to malfunction. The transformers use a free-for-all strategy to determine the master transformer, which then sends commands to other transformers. If the master transformer fails and shuts down, all slave transformers must also shut down because they have no commands to receive. The entire system cannot operate with faults, reducing the overall system efficiency. In the existing technology, the master transformer sends AC voltage phase signals, amplitude, and frequency to the slave transformers, but does not achieve synchronization of the switching frequencies between transformers. This can easily cause circulating currents in small-capacity grids, leading to equipment failures and affecting the overall power supply quality of the grid.

[0004] Therefore, a better method for parallel control of multiple converters in energy storage systems is needed to avoid circulating currents, reduce equipment failures, and thus improve the power supply quality of the entire power grid. Summary of the Invention

[0005] This invention provides a method for parallel control of multiple converters in an energy storage system, which solves the technical problem of circulating current generated by the parallel output of each converter, avoids the generation of circulating current, reduces equipment failure, and thus improves the power supply quality of the entire power grid.

[0006] This invention provides a method for parallel control of multiple converters in an energy storage system, comprising the following steps:

[0007] Initialize all electrical devices in the energy storage system;

[0008] Each converter in the electrical equipment reads its own address information;

[0009] Each of the converters reads electrical data transmitted from other converters through a first optical fiber based on the address information; the first optical fiber is a data optical fiber.

[0010] Each converter determines whether its own address information is in a preset state as a master converter or a slave converter;

[0011] If it is the master converter, the master converter sends the synchronization pulse signal to each of the slave converters through the second optical fiber. If it is the slave converter, each of the slave converters connects to the grid based on the electrical data. The second optical fiber is a synchronization optical fiber.

[0012] In an embodiment of the present invention,

[0013] If the step involves the slave converter, then the step of connecting each slave converter to the grid based on the electrical data further includes:

[0014] If it is a slave converter, each slave converter detects whether the master converter has a fault;

[0015] If the master converter has a fault, each slave converter determines whether its own address information is in the preset state of a master converter or a slave converter.

[0016] If it is the master converter, then the slave converter is upgraded to the master converter, and the master converter sends the synchronization pulse signal to each of the slave converters through the second optical fiber. If it is the slave converter, then each of the slave converters is connected to the grid based on the electrical data.

[0017] In an embodiment of the present invention,

[0018] The electrical data includes at least one of the following: AC voltage phase, AC voltage amplitude, AC voltage frequency, switching frequency, and output current.

[0019] In an embodiment of the present invention,

[0020] If the converter is the master converter, the step of the master converter sending the synchronization pulse signal to each of the slave converters through the second optical fiber includes:

[0021] The master converter transmits the synchronization pulse signal to the adjacent slave converter via the second optical fiber at the zero crossing of each switching cycle;

[0022] After receiving the synchronization pulse signal from the master converter, the slave converter performs zero-crossing correction of the switching cycle and simultaneously transmits the synchronization pulse signal to the adjacent slave converter through the second optical fiber.

[0023] In an embodiment of the present invention,

[0024] If the converter is the master converter, then the master converter sends a synchronization pulse signal to each of the slave converters via the second optical fiber. If the converter is a slave converter, then after the step of the slave converters performing grid connection based on the electrical data, the process further includes:

[0025] Each of the converters updates the status of the address information and transmits the electrical data to other converters via the first optical fiber.

[0026] In an embodiment of the present invention,

[0027] The number of the main converters in the energy storage system is 1 at the same time, and the number of the slave converters in the energy storage system is greater than or equal to 1 at the same time.

[0028] In an embodiment of the present invention,

[0029] The first optical fiber and the second optical fiber are respectively connected to adjacent converters in the energy storage system.

[0030] This invention provides a device for parallel control of multiple converters in an energy storage system, comprising:

[0031] Initialization module: Initializes all electrical devices in the energy storage system;

[0032] Address information reading module: Each converter in the electrical equipment reads its own address information;

[0033] Electrical data reading module: Each converter reads electrical data transmitted from other converters through a first optical fiber based on the address information; the first optical fiber is a data optical fiber.

[0034] Status determination module: Each converter determines whether its own address information is in the preset state of a master converter or a slave converter;

[0035] Synchronous grid connection module: If it is the master converter, the master converter sends a synchronization pulse signal to each of the slave converters through the second optical fiber. If it is the slave converter, each of the slave converters connects to the grid based on the electrical data. The second optical fiber is a synchronization optical fiber.

[0036] This invention provides a storage medium on which a computer program is stored.

[0037] When the program is executed by the processor, it implements the steps of the method for parallel control of multiple converters in an energy storage system as described in any of the above descriptions.

[0038] This invention provides an electronic device, comprising:

[0039] Memory, on which computer programs are stored; and

[0040] A processor for executing the computer program in the memory to implement the steps of the method for parallel control of multiple converters in an energy storage system as described in any of the above descriptions.

[0041] Compared with the prior art, one or more embodiments of the present invention may have the following advantages:

[0042] This invention achieves carrier synchronization of each converter by sending a synchronization pulse from the main converter, eliminating the current circulation between units generated by the parallel operation of the converters. At the same time, it transmits electrical data through a data fiber, enabling each converter to collect the operating status of other converters. When an abnormality is detected in the status of other converters, the control strategy of updating its own status is updated in a timely manner, ensuring the reliable and efficient operation of the energy storage system.

[0043] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description, claims, and drawings. Attached Figure Description

[0044] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0045] Figure 1 This is a flowchart illustrating the method for parallel control of multiple converters in an energy storage system according to the present invention.

[0046] Figure 2 This is a schematic diagram of the communication connection architecture between the various converters of the present invention;

[0047] Figure 3 This is a schematic diagram of the algorithm flow for converter communication data processing within one calculation cycle of the present invention;

[0048] Figure 4 This is a schematic diagram of the device architecture for parallel control of multiple converters in the energy storage system of the present invention. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. This will allow for a full understanding of how the invention uses technical means to solve technical problems and achieve technical effects, and enable its implementation accordingly. It should be noted that, as long as there is no conflict, the various embodiments and features within each embodiment of this invention can be combined with each other, and the resulting technical solutions are all within the protection scope of this invention.

[0050] First Embodiment

[0051] Figure 1 This is a flowchart illustrating the method for parallel control of multiple converters in the energy storage system according to this embodiment;

[0052] Figure 2 This is a schematic diagram of the communication connection architecture between the converters in this embodiment;

[0053] Figure 3 This is a schematic diagram of the algorithm flow for converter communication data processing within one calculation cycle in this embodiment.

[0054] This embodiment provides a method for parallel control of multiple converters in an energy storage system, including the following steps:

[0055] Initialize all electrical equipment in the energy storage system;

[0056] Each converter in the electrical equipment reads its own address information;

[0057] Each converter reads electrical data transmitted from other converters through a first optical fiber based on address information; the first optical fiber is a data optical fiber.

[0058] Each converter determines whether its own address information is in the preset state of a master converter or a slave converter;

[0059] If it is the master converter, the master converter sends the synchronization pulse signal to each slave converter through the second optical fiber. If it is a slave converter, each slave converter connects to the grid based on electrical data, and the second optical fiber is a synchronization fiber.

[0060] Specifically, in this embodiment, a method for controlling the parallel operation of multiple converters in an energy storage system is provided, including the following steps:

[0061] S100 initializes the electrical equipment in the energy storage system.

[0062] Specifically, in this embodiment, the energy storage system includes electrical equipment such as energy storage battery units, converter units, filter units, isolation transformer units, and grid-connected contactor units. Within one cycle, all electrical equipment in the energy storage system is first initialized, and each converter in the converter unit is also initialized. All electrical data is returned to its initial position to facilitate synchronization of electrical data and grid connection within this cycle.

[0063] S110, each converter in the electrical equipment reads its own address information.

[0064] Specifically, in this embodiment, after each converter in the electrical equipment is initialized, it first reads the address information ID number recorded in the converter's internal memory to facilitate the determination of the state of each converter.

[0065] S120, each converter reads electrical data transmitted from other converters through the first optical fiber based on address information. The first optical fiber is a data optical fiber.

[0066] Specifically, in this embodiment, each converter transmits data to other units in the energy storage system through a human-machine interface (HMI). Furthermore, as... Figure 2 As shown, in this embodiment, the first optical fiber connects adjacent converters in the energy storage system sequentially. That is, all converters in the energy storage system are connected in pairs using the first optical fiber. The first optical fiber is a data fiber, also known as a communication fiber, used to transmit electrical data from each converter. By transmitting electrical data through the data fiber, each converter can collect the real-time operating status of other converters. In this embodiment, each converter reads the electrical data transmitted from other converters based on address information via the first optical fiber. The electrical data includes at least one of AC voltage phase, AC voltage amplitude, AC voltage frequency, switching frequency, and output current. Because this embodiment also transmits the converter's switching frequency, in addition to maintaining synchronization of AC voltage phase, AC voltage amplitude, AC voltage frequency, and output current, it also helps maintain synchronized switching frequencies, thereby eliminating current circulation between converter units generated by parallel operation.

[0067] S130, each converter determines whether its own address information is a master converter or a slave converter.

[0068] Specifically, in this embodiment, after receiving electrical data from other converters, each converter determines whether its own address information preset state is a master converter or a slave converter based on the ID number of the address information. By determining whether the preset state of the address information is a master converter or a slave converter, the master converter in each converter can be identified, which is beneficial for each slave converter to follow the master converter for grid connection.

[0069] S140, if it is the master converter, the master converter sends the synchronization pulse signal to each slave converter through the second optical fiber; if it is a slave converter, each slave converter connects to the grid based on electrical data, and the second optical fiber is a synchronization optical fiber.

[0070] Specifically, if the address information of a certain converter is preset to be the master converter, the master converter sends the synchronization pulse signal to each slave converter through the second optical fiber, which is the synchronization optical fiber.

[0071] If the address information of one or more converters is preset to a slave converter, then each slave converter will be connected to the grid based on electrical data.

[0072] In this embodiment, the second optical fiber is sequentially connected to adjacent converters in the energy storage system. That is, all converters in the energy storage system are connected in pairs using the second optical fiber. The second optical fiber is a synchronization optical fiber and is used to transmit converter carrier synchronization pulses.

[0073] In this embodiment, if the main converter is used, the step of the main converter sending the synchronization pulse signal to each slave converter through the second optical fiber includes:

[0074] The master converter sends a synchronization pulse signal to the adjacent slave converter via a second optical fiber at the zero crossing of each switching cycle.

[0075] After receiving the synchronization pulse signal from the master converter, the slave converter performs zero-crossing correction of the switching cycle and simultaneously sends the synchronization pulse signal to the adjacent slave converter through the second optical fiber.

[0076] Specifically, in this embodiment, if the address information of a certain converter is preset to be a master converter, the master converter sends a synchronization pulse signal to the adjacent slave converter through the second optical fiber when the switching frequency cycle crosses zero.

[0077] After receiving the synchronization pulse signal from the master converter, the adjacent slave converters perform zero-crossing correction of their switching frequency period. Simultaneously, they transmit the synchronization pulse signal to the adjacent slave converters via a second optical fiber until all slave converters receive the synchronization pulse signal. This ensures that all slave converters in the energy storage system perform zero-crossing correction of their switching frequency period. By receiving synchronization pulses and performing zero-crossing correction on all slave converters, carrier synchronization of each converter is achieved, thereby eliminating the current circulation between converter units caused by parallel operation.

[0078] In this embodiment, if the converters are slave converters, the step of grid connection based on electrical data for each slave converter further includes:

[0079] If it is a slave converter, each slave converter detects whether the master converter has a fault;

[0080] If the master converter has a fault, each slave converter determines whether its own address information is in the preset state of master converter or slave converter.

[0081] If it is the master converter, then the slave converter is upgraded to the master converter, and the master converter sends the synchronization pulse signal to each slave converter through the second optical fiber. If it is a slave converter, then each slave converter is connected to the grid based on electrical data.

[0082] Specifically, in this embodiment, if the preset state of the address information of one or more converters is a slave converter, each slave converter will detect whether the master converter has a fault through the first optical fiber. If the master converter has a fault, each slave converter will determine whether the preset state of its own address information is a master converter or a slave converter.

[0083] If the address information of a slave converter is preset to be that of a master converter, then this slave converter is upgraded to a master converter, and the master converter sends a synchronization pulse signal to each slave converter through the second optical fiber. If the address information of one or more slave converters is preset to be that of a slave converter, then each slave converter is connected to the grid based on electrical data.

[0084] In this embodiment, the number of master converters in the energy storage system can only be one at a time, and the number of slave converters in the energy storage system can be greater than or equal to one at a time. In this embodiment, the converters in the energy storage system use a one-master-multiple-slave transmission method. When the master converter fails, other slave converters will automatically switch master-slave status based on the detection of their own address information and preset states. This master-slave status switching mechanism ensures that synchronous output can still be achieved when the master converter fails. In a large-capacity grid environment, the converters can still operate without shutdown even if the communication system fails, improving the system's reliability.

[0085] In this embodiment, since all slave converters need to correct their switching frequency cycle according to the synchronization pulse signal sent by the master converter, and adjust their own electrical data with the synchronization pulse signal, it is convenient to achieve synchronous output through grid connection.

[0086] In this embodiment, if it is a master converter, the master converter sends a synchronization pulse signal to each slave converter through the second optical fiber. If it is a slave converter, after the step of each slave converter performing grid connection based on electrical data, the following is also included:

[0087] Each converter updates its address information status and sends electrical data to other converters via the first optical fiber.

[0088] Specifically, after the master-slave status of each converter in the energy storage system is confirmed, each converter updates its own address information and sends electrical data to other converters via the first optical fiber. This allows all converters to operate in the next cycle according to the master-slave relationship. Data transmission via the data optical fiber enables each converter to collect the operating status of other converters. When an abnormality is detected in the status of other converters, each converter can promptly update its own control strategy, ensuring the reliable and efficient operation of the energy storage system.

[0089] In this embodiment, each converter establishes a communication connection through the first optical fiber to exchange data, thereby realizing the reliable operation of multiple units in the energy storage system and enhancing the reliability and scalability of the energy storage system.

[0090] In summary, this embodiment provides a method for controlling multiple converters in an energy storage system. Each converter is connected in pairs via two sets of optical fibers. The master converter sends synchronization pulses to each slave converter, achieving carrier synchronization between converters and reducing circulating current. This method implements a master-slave state switching mechanism during the operation of each converter, ensuring synchronized output even when the master converter fails. In a large-capacity grid environment, even if the communication system of each converter fails, the converters can still operate continuously without shutdown, improving the reliability of the energy storage system.

[0091] Second Embodiment

[0092] Figure 4 This is a schematic diagram of the device architecture for parallel control of multiple converters in the energy storage system of this embodiment.

[0093] This invention provides a device for parallel control of multiple converters in an energy storage system, comprising:

[0094] Initialization module: Initializes all electrical devices in the energy storage system;

[0095] Address information reading module: Each converter in the electrical equipment reads its own address information;

[0096] Electrical data reading module: Each converter reads electrical data transmitted from other converters through a first optical fiber based on the address information; the first optical fiber is a data optical fiber.

[0097] Status determination module: Each converter determines whether its own address information is in the preset state of a master converter or a slave converter;

[0098] Synchronous grid connection module: If it is the master converter, the master converter sends a synchronization pulse signal to each of the slave converters through the second optical fiber. If it is the slave converter, each of the slave converters connects to the grid based on the electrical data. The second optical fiber is a synchronization optical fiber.

[0099] This embodiment achieves carrier synchronization of each converter by sending a synchronization pulse from the main converter, eliminating the current circulation between units generated by the parallel operation of the converters. At the same time, electrical data is transmitted through the data fiber, enabling each converter to collect the operating status of other converters. When an abnormality is detected in the status of other converters, the control strategy of updating its own status is updated in a timely manner to ensure the reliable and efficient operation of the energy storage system.

[0100] Third Embodiment

[0101] This embodiment provides a storage medium on which a computer program is stored.

[0102] When the program is executed by the processor, it implements the steps of the method for parallel control of multiple converters in an energy storage system as described in any of the above descriptions.

[0103] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining both software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0104] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and RAMbus dynamic RAM (RDRAM), etc.

[0105] Fourth embodiment

[0106] This embodiment provides an electronic device, including:

[0107] Memory, on which computer programs are stored; and

[0108] A processor for executing the computer program in the memory to implement the steps of the method for parallel control of multiple converters in an energy storage system as described in any of the above descriptions.

[0109] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the reflow... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0110] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0111] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0112] While the embodiments disclosed in this invention are as described above, the content is merely for the purpose of facilitating understanding of the invention and is not intended to limit the invention. Any person skilled in the art can make any modifications and changes in form and detail of the implementation without departing from the spirit and scope of this invention. The scope of protection of this invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for parallel control of multiple converters in an energy storage system, characterized in that, Includes the following steps: Initialize all electrical devices in the energy storage system; Each converter in the electrical equipment reads its own address information; Each of the converters reads electrical data transmitted from other converters through a first optical fiber based on the address information. The first optical fiber is a data optical fiber and is connected to each of the converters in a loop. Each converter determines whether its own address information is in a preset state as a master converter or a slave converter; If it is the master converter, the master converter sends the synchronization pulse signal to each of the slave converters through the second optical fiber. If it is the slave converter, each of the slave converters is connected to the grid based on the electrical data. The second optical fiber is a synchronization optical fiber, and the second optical fiber is connected to each of the converters in a loop. If it is the slave converter, the slave converter performs grid connection based on the electrical data obtained through the first optical fiber, and receives a synchronization pulse signal from the second optical fiber to correct its own switching cycle; If the converter is a slave converter, the step of each slave converter connecting to the grid based on the electrical data further includes: if the converter is a slave converter, each slave converter detects whether the master converter has a fault; If the master converter malfunctions, each slave converter determines whether its preset address information is a master converter or a slave converter. If it is a master converter, the slave converter is upgraded to a master converter, and the master converter sends the synchronization pulse signal to each slave converter through the second optical fiber. If it is a slave converter, each slave converter is connected to the grid based on the electrical data.

2. The method according to claim 1, characterized in that, The electrical data includes at least one of the following: AC voltage phase, AC voltage amplitude, AC voltage frequency, switching frequency, and output current.

3. The method according to claim 1, characterized in that, If the converter is the master converter, the step of the master converter sending the synchronization pulse signal to each of the slave converters through the second optical fiber includes: The master converter transmits the synchronization pulse signal to the adjacent slave converter via the second optical fiber at the zero crossing of each switching cycle; After receiving the synchronization pulse signal from the master converter, the slave converter performs zero-crossing correction of the switching cycle and simultaneously transmits the synchronization pulse signal to the adjacent slave converter through the second optical fiber.

4. The method according to claim 1, characterized in that, If the converter is the master converter, then the master converter sends a synchronization pulse signal to each of the slave converters via the second optical fiber. If the converter is a slave converter, then after the step of the slave converters performing grid connection based on the electrical data, the process further includes: Each of the converters updates the status of the address information and transmits the electrical data to other converters via the first optical fiber.

5. The method according to any one of claims 1 to 4, characterized in that, The number of the main converters in the energy storage system is 1 at the same time, and the number of the slave converters in the energy storage system is greater than or equal to 1 at the same time.

6. The method according to any one of claims 1 to 4, characterized in that, The first optical fiber and the second optical fiber are respectively connected to adjacent converters in the energy storage system.

7. A device for parallel control of multiple converters in an energy storage system, characterized in that, include: Initialization module: Initializes all electrical devices in the energy storage system; Address information reading module: Each converter in the electrical equipment reads its own address information; Electrical data reading module: Each converter reads electrical data transmitted from other converters through a first optical fiber based on the address information. The first optical fiber is a data optical fiber, and the first optical fiber is connected to each converter in a loop. Status determination module: Each converter determines whether its own address information is in the preset state of a master converter or a slave converter; Synchronous grid connection module: If it is the master converter, the master converter sends a synchronization pulse signal to each of the slave converters through the second optical fiber; if it is a slave converter, each of the slave converters performs grid connection based on the electrical data; the second optical fiber is a synchronization optical fiber, and the second optical fiber is connected to each of the converters in a loop; if it is a slave converter, the slave converter performs grid connection based on the electrical data obtained through the first optical fiber, and receives a synchronization pulse signal from the second optical fiber to correct its own switching cycle. If the converter is a slave converter, the step of each slave converter connecting to the grid based on the electrical data further includes: if the converter is a slave converter, each slave converter detects whether the master converter has a fault; If the master converter malfunctions, each slave converter determines whether its preset address information is a master converter or a slave converter. If it is a master converter, the slave converter is upgraded to a master converter, and the master converter sends the synchronization pulse signal to each slave converter through the second optical fiber. If it is a slave converter, each slave converter is connected to the grid based on the electrical data.

8. A storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the program implements the steps of the method for parallel control of multiple converters in an energy storage system as described in any one of claims 1 to 6.

9. An electronic device, characterized in that, include: A memory on which computer programs are stored; as well as A processor for executing the computer program in the memory to implement the steps of the method for parallel control of multiple converters in an energy storage system according to any one of claims 1 to 6.

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